import json

str= '[{"children":[{"label":"行政事务","value":"part_a"},{"label":"审计工作","value":"part_b"}],"label":{"en_US":"dep","zh_CN":"行政管理类","type":"i18n"},"value":"part"},{"children":[{"label":"a产品","value":"product_a"},{"label":"b产品","value":"product_b"}],"label":"产品","value":"product"}]'
json2python= json.loads(str)
print(json2python)